Issue 129457
Summary [Flang][OpenMP] No error checking of a continuation line that does not have a line to be continued in Fixed Source Form Conditional Compilation Sentinel
Labels flang:openmp
Assignees
Reporter ohno-fj
    ```
Version of flang : 21.0.0(c8b40867d144395ad3c306a3cf87f970e0f97f07)/AArch64
```

The attached program is incorrect.  
In `Fixed Source Form Conditional Compilation Sentinel`, flang does not output an error message during compilation for a continuation line that does not have a line to be continued.

The following are the test program, Flang, Gfortran and ifx compilation/execution result.

err_sngg081g_2.f:
```fortran
c$   !   0      !

      print *,'pass'
      end
```

```
$ export OMP_NUM_THREADS=2; flang -fopenmp err_sngg081g_2.f; ./a.out
flang-20: warning: OpenMP support in flang is still experimental [-Wexperimental-option]
 pass
$
```

```
$ export OMP_NUM_THREADS=2; gfortran -fopenmp err_sngg081g_2.f; ./a.out
 pass
$
```

```
$ ifx -qopenmp err_sngg081g_2.f
err_sngg081g_2.f(1): error #5118: First statement in file must not be continued
c$   !   0 !
-----^
err_sngg081g_2.f(1): error #5082: Syntax error, found INTEGER_CONSTANT '0' when expecting one of: <LABEL> <END-OF-STATEMENT>
; <IDENTIFIER> TYPE MODULE ELEMENTAL IMPURE NON_RECURSIVE ...
c$   !   0 !
---------^
err_sngg081g_2.f(1): error #6905: A label cannot be zero; it must be an integer in the range 1 through 99999.   [0]
c$   !   0 !
---------^
err_sngg081g_2.f(1): error #6321: An unterminated block exists.
c$   !   0      !
^
err_sngg081g_2.f(1): error #6323: This label is not defined in this scoping unit.   [0]
c$   !   0 !
---------^
compilation aborted for err_sngg081g_2.f (code 1)
$
```


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